/* 首页 */
.bigdata-header {
    position: absolute;
    /* 调整宽高 */
    line-height: 66px;
    width: 100%;height: 66px;
    color: #fff;z-index: 9999;
    /* border-bottom: 1px solid white; */
}
.logo {
    position: absolute;
    top: 4px;left: 1%;
    width: 230px;height: 30px;
    background: url('../images/new-logo-white.png');
}
.nav {
    position: absolute;
    left: 50%;
    height: 100%;
    transform: translate(-50%, 0);
}
.nav-item {
    cursor: pointer;
    font-size: 15px;
    margin: 0 18px;
    height: 100%;
}
.nav-item.active {
    font-size: 18px;
    box-sizing: border-box;
    border-bottom: 2px solid #fff;
}

/* 登录注册 */
.login-register {
    position: absolute;
    right: 1%;
    height: 100%;
}
.login-register .login {
    width: 52px;height: 22px;
    border: 1px solid #ccc;
    border-radius: 12px;color: #fff;
    background-color: transparent;
    margin-right: 5px;
}
.login-register .register {
    width: 80px;height: 22px;
    border: none;
    background-color: #fd510a;
    color: #fff;border-radius: 11px;   
}
.banner {
    position: relative;
    height: 360px;
    margin-bottom: 30px;
    background: rgb(29,29,29);
}
canvas{background:none;}
.banner #mydiv{
    position: absolute;
    top: 20px;
}
/* 主体内容 */
main{margin: 20px auto;height: 2200px;position: relative;background: #f8f8f8;}
.banner>div{
    position: relative;
    text-align: center;
    top: 130px;color: #fff;
}
.ban-title{font-size: 36px;}
.ban-des{margin: 12px 0;}
.title {font-weight: bold;line-height: 36px;margin: 20px auto;}
.title span{font-size: 15px;color: #ccc;}
.title::after{
    content: '';
    display: block;
    width: 18px;height: 2px;
    background: #1271EF;
}
.substance li{
    margin-right: 25px;
    padding: 10px;
    border: 1px solid #eee;
    width: 356px;height: 342px;
}
.substance img{
    width: 334px;height: 145px;margin-bottom: 10px;
}
.substance p {margin: 12px;color: #000;}
.substance a p:nth-child(3){
    font-size: 12px;color: #666;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 4;
    overflow: hidden;
}
.substance a p:nth-child(4){
    color: #1271ef;font-size: 14px;
}
.partner div{
    text-align: center;
    display: inline-block;
    margin: 0 20px 15px 0;
    width: 354px;height: 123px;
    padding: 42px;background: #fff;
}
/* 底部样式 */
footer {height: 300px;}
footer dl{float: left;margin:0 82px 40px 0;}
footer dl dt{margin-bottom: 34px;font-size: 16;}
footer dl dd{height: 28px;line-height: 28px;font-size: 12px;color: #aaa;}
footer .QR-code{text-align: right;}
footer .contact p{margin:8px 0 24px;color: #ccc;font-size: 13px;}
.copy{font-size: 14px;color: #ccc;height: 46px;line-height: 46px;}
.copy img {position: relative;top: 3px;margin-right: 4px;}
.return{
    border-radius: 21px;
    width: 42px;height: 42px;
    position: fixed;bottom:20px;right: 134px;display: none;
    background: url("../images/returntopicon.jpg") no-repeat -162px -54px;
}
.roll{
    position: fixed;
    right: 200px;
    top: 50%;font-size: 14px;
    line-height: 50px;
    transform: translateY(-50%);
    cursor: pointer;
}
.on::after {
    content: '';
    display: block;
    position: relative;
    left: -16px;top: -26px;
    width: 10px;height: 2px;
    background: #1271EF;
}